The attack happened on Friday, Oct. 26, about 5 p.m. at a bus stop near 39th and Main streets.

The video shows the passenger arguing with the driver at a stop. The passenger left the bus twice and then boarded again, punching the driver in the face. A second video offers a long, clear look at the passenger's face.

The driver told police that the man asked him for an unused exchange pass for a prior passenger. The driver said he ignored the attacker, who hit him and said, "You could have given me that transfer."

Police said the driver suffered facial bruises and swelling from the attack, injuries investigators categorized as minor.

The assault comes just weeks after another bus driver was punched by a passenger who was asked to leave after not paying the fare.

"You never want to see these things happen, but with 16 million people boarding the bus every year, these incidents can happen," said ATA spokeswoman Cindy Baker.

She said the driver in the latest incident followed all proper procedures. She said the cameras on the buses not only help deter crime but can solve them.

"Our drivers do not feel, on a day-to-day basis, insecure," she said. "These incidents happen, but they happen throughout the city and all over."

A driver who spoke to KMBC 9 News said he's had to deal with unruly passengers in the past. After hearing about the attack, he said he worries about what could happen every time he pulls up to a stop.

He said ATA does a lot of things to protect his security, but it could be better.

"It's just sad that we're out here every day just trying to help people, at least get them where they need to be," he said.

Anyone with information that can help identify the man in the surveillance pictures is asked to call the Crime Stoppers TIPS Hotline at 816-474-8477.